The purposes of the present study were to (1) describe rates of peer victimization in young adolescents with attention-deficit/hyperactivity disorder (ADHD), (2) evaluate the association between types of peer victimization (i.e., physical, relational, reputational) and internalizing problems (i.e., anxiety, depression, self-esteem), and (3) examine whether associations between victimization and internalizing problems differ for males or females. Participants were 131 middle school students (ages 11–15 years, 73% male, 76% White) diagnosed with ADHD who completed ratings of victimization, anxiety, depression, and self-esteem. Over half of participants (57%) reported experiencing at least one victimization behavior at a rate of once per week or more, with higher rates of relational victimization (51%) than reputational victimization (17%) or physical victimization (14%). Males reported experiencing more physical victimization than females but males and females did not differ in rates of relational or reputational victimization. Whereas relational and physical victimization were both uniquely associated with greater anxiety for both males and females, relational victimization was associated with greater depressive symptoms and lower self-esteem for males but not females. These findings indicate that young adolescents with ADHD frequently experience peer victimization, and that the association between victimization and internalizing problems among young adolescents with ADHD differs as a result of victimization type, internalizing domain, and sex.